Solve Kinetic Friction Coeff for Physics Homework

[shell4987]

Homework Statement

You push a 2.4 kg block against a horizontal spring, compressing the spring by 29 cm. Then you release the block, and the spring sends it sliding across a tabletop. It stops 83 cm from where you released it. The spring constant is 300 N/m. What is the coefficient of kinetic friction between the block and the table?

Homework Equations

0 (initial KE) + 0 (initial PE) + 1/2k(change in X)^2= 0 (final KE) + 0 (final PE) + Ukmgd and solve for Uk (coeffient of kinetic friction)

The Attempt at a Solution

I did this plugged in 300 for k, 0.54 for change in x, 2.4 for m, 9.8 for g, and 0.83 for d... I got 2.24 for the answer and it was wrong. I can't seem to find out what I'm doing wrong with this problem.

 

[Doc Al]

I did this plugged in 300 for k, 0.54 for change in x...

How far was the spring compressed?

 

[shell4987]

How far was the spring compressed?

It would be 0.29m right?

 

[Doc Al]

It would be 0.29m right?

Right.